Purification, characterization and molecular cloning of chymotrypsin inhibitor peptides from the venom of Burmese Daboia russelii siamensis

► A novel chymotrypsin inhibitor, BBPTI-1, was found in Burmese Daboia russelii siamensis venom. ► BBPTI-1 showed strong chymotrypsin inhibition activity, but no trypsin inhibition activity. ► BBPTI-1 was cloned along with another cDNA with an eight nucleotide deletion.